|Fernando joins Man City|
City confirmed the deal on Thursday although the length of the 26-year-old's contract was not disclosed.
"I will give my all every time I play and I'm looking forward to many happy years in Manchester," Fernando said.
"I am so happy to finally be joining Manchester City," he added. "I know there was talk of me possibly signing last January so I am delighted that the deal has now been done and that I am a City player.
"I'm looking forward to meeting my new team-mates and helping City to defend the title. It is a very exciting time to be part of this football club and I cannot wait to play in the Premier League."
"I have enjoyed my stay with Porto and I thank the club and the fans for their support during my time in Portugal. Now I am ready for a new chapter in my career."